8.2.66 DL Flow Level Marking
29.2443GPPInterface between the Control Plane and the User Plane nodesRelease 17TS
The DL Flow Level Marking IE type shall be encoded as shown in Figure 8.2.66-1.
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Bits |
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Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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1 to 2 |
Type = 97 (decimal) |
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3 to 4 |
Length = n |
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5 |
Spare |
SCI |
TTC |
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m to (m+1) |
ToS/Traffic Class |
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p to (p+1) |
Service Class Indicator |
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q to (n+4) |
These octet(s) is/are present only if explicitly specified |
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Figure 8.2.66-1: DL Flow Level Marking
The following flags are coded within Octet 5:
– Bit 1 – TTC (ToS/Traffic Class): If this bit is set to "1", then the ToS/Traffic Class field shall be present, otherwise the ToS/Traffic Class field shall not be present.
– Bit 2 – SCI (Service Class Indicator): If this bit is set to "1", then the Service Class Indicator field shall be present, otherwise the Service Class Indicator field shall not be present.
– Bit 3 to 8: Spare, for future use and set to "0".
The ToS/Traffic Class field, when present, shall be encoded on two octets as an OctetString. The first octet shall contain the IPv4 Type-of-Service or the IPv6 Traffic-Class field and the second octet shall contain the ToS/Traffic Class mask field. See clause 5.3.15 of 3GPP TS 29.212 [8].
Octets p and (p+1) of the Service Class Indicator field, when present, shall be encoded respectively as octets 2 and 3 of the Service Class Indicator Extension Header specified in Figure 5.2.2.3-1 of 3GPP TS 29.281 [3].